NACA air duct......... need help......

[B_rad88]

hey guys, um i need a bit of help with performing plastic surgery on a window............ im tring(well atleast i hope i can) to make a naca style air duct in the engine cover window of a jaguar xj220.......

here are some pics of what im tring to replicate:

my concern is making the cut into the window, and making it look proper. can anyone shed some how-to's on this please?

Thank You!

[Jairus]

Tinted glass and a dark recess...

EASY! Cut the hole and place a black painted hollow, correctly shaped, beneath it.

If it just HAS to be clear... vac-form and tint the scoop below. The third option is to make a mold for the whole darned glass and vac-form it.

But the first solution is always the simplest.

J

[B_rad88]

Tinted glass and a dark recess...

EASY! Cut the hole and place a black painted hollow, correctly shaped, beneath it.

If it just HAS to be clear... vac-form and tint the scoop below. The third option is to make a mold for the whole darned glass and vac-form it.

But the first solution is always the simplest.

J

thank you jairus for the tip, but 1. i don't own or have access to a vacuform machine or anything like it, also 2. my problem is still cutting the plastic, im not sure on how to go about it, since i have only 1 window, i don't want to mess it up badly. if you catch my drift. i also have no other detailed pics of the window with the duct, like inside of the window, or other views, those 3 pics is what i got to go from, so measurements, position, ect. im so not sure about, so its like guessing in the wind.

Edited September 25, 2010 by B_rad88

[Jairus]

...so its like guessing in the wind.

Skill level is a learned thing. This is a learning exercise that if successful then you win! If not... you move on from there. You asked for an answer and I gave you three solutions. The 4th is do nothing.

But, you are never ahead by doing nothing and not giving it a try. Move out of your comfort zone, drill a hole and start filing until the hole is the right shape.

Then Google "NACA" and find the right shape for the structure beneath.

Vac-forming is very easy and basic. I have showed how to do it here on the forum and it's been printed in two issues of Model Cars Magazine.

You don't need a store-brought vac-former... you can MAKE YOUR OWN!

But there again it takes time to research and build and practice, practice, practice.

Easiest way out is to simply paint a flat black spot rougly the shape of a NACA duct on the glass and your done!

So, what will you do?

[B_rad88]

Skill level is a learned thing. This is a learning exercise that if successful then you win! If not... you move on from there. You asked for an answer and I gave you three solutions. The 4th is do nothing.

But, you are never ahead by doing nothing and not giving it a try. Move out of your comfort zone, drill a hole and start filing until the hole is the right shape.

Then Google "NACA" and find the right shape for the structure beneath.

Vac-forming is very easy and basic. I have showed how to do it here on the forum and it's been printed in two issues of Model Cars Magazine.

You don't need a store-brought vac-former... you can MAKE YOUR OWN!

But there again it takes time to research and build and practice, practice, practice.

Easiest way out is to simply paint a flat black spot rougly the shape of a NACA duct on the glass and your done!

So, what will you do?

and i thank you for the tips, but yes i normally don't like going out of my confort zone, lol. i'll give it a try on scrap material, but just unsure still, i'll never know till i try it, and as far as the bottom of the duct(inside) i dunno about it, cause i don't have better pics of the jag race car's duct. so thats a random guess, yours is as good as mine on how the inside looks.......... and about making my own machine, i have no money, no time, and im in the process of moving, so i have no place to make it anyways........

thank you for the tips, i do greatly appricate it, i will give it a try in scrape material, or something.

thank you,

Brandon

[Jairus]

The internet is the biggest source of information this planet has ever seen. In thirty seconds I found these two images. You already knew the name of the duct, so just use "Google" and you cannot believe what help you can find!!!

(Just keep the internet filters on tho... )

Edited September 26, 2010 by Jairus

[Harry P.]

Easy way: make a new back glass out of clear acetate (you can find it at art supply stores or Hobby lobby). Get a piece of thick, clear acetate larger than the window, cover both sides with masking tape to protect from scratches as you work. Lay the kit glass on the acetate, trace around the kit glass, then trim your new acetate "glass" to size. Measure and lay out a center line on your new glass, draw the shape of the duct opening, and use a sharp X-acto to cut out the hole. Clean up any rough spots with a fine sanding stick. Remove the masking tape, add the duct body to the underside (using Jairus' references above), and there ya go.

If you mess up the hole, no problem. Try again with a new piece of acetate.

[Harry P.]

The internet is the biggest source of information this planet has ever seen. In thirty seconds I found these two images. You already knew the name of the duct, so just use "Google" and you cannot believe what help you can find!!!

(Just keep the internet filters on tho... )

But that takes all the fun out of a Google search...

[Jairus]

Well, Harry I feel it filters out the rubbish what most of the Internet has become sadly. You call it fun, I call it needless distraction...

Nice project there Brandon. Could you show us what you are starting with? I have no idea what the Jag kit looks like "unmolested". (Now there is a Google search sure to bring hours of fun....)

Edited September 26, 2010 by Jairus

[B_rad88]

The internet is the biggest source of information this planet has ever seen. In thirty seconds I found these two images. You already knew the name of the duct, so just use "Google" and you cannot believe what help you can find!!!

(Just keep the internet filters on tho... )

ok, i got the general idea on it now, thank you jairus very much! and when i had looked for naca ducts on google it gave me the "side window vents" with the opening for tubing to attach too, (like this http://www.gmpracingproducts.com.au/i/products/window-ducts/misc/NACA-Double-Ducts.JPG ) but i know thats wrong for what im tring to do.

Easy way: make a new back glass out of clear acetate (you can find it at art supply stores or Hobby lobby). Get a piece of thick, clear acetate larger than the window, cover both sides with masking tape to protect from scratches as you work. Lay the kit glass on the acetate, trace around the kit glass, then trim your new acetate "glass" to size. Measure and lay out a center line on your new glass, draw the shape of the duct opening, and use a sharp X-acto to cut out the hole. Clean up any rough spots with a fine sanding stick. Remove the masking tape, add the duct body to the underside (using Jairus' references above), and there ya go.

If you mess up the hole, no problem. Try again with a new piece of acetate.

and hum, didn't think of making a new window for it.......... i do have scrap plastic from kid toys, ect. but i think its to thin........ idk. thank you for that tip, after tring on some scrap first, i'll see how this goes, and then go from there....... hopefully.

[B_rad88]

Well, Harry I feel it filters out the rubbish what most of the Internet has become sadly. You call it fun, I call it needless distraction...

Nice project there Brandon. Could you show us what you are starting with? I have no idea what the Jag kit looks like "unmolested". (Now there is a Google search sure to bring hours of fun....)

thank you, it was a project that was supposed to be for the "drift car" build off, but sadly it was stalled for this very reason why im posting this thread, i didn't know how to make the duct. also i don't have the proper decals i need to finish the body.......... but i have been thinking of bring it back out of the stalled stack and working on it a little bit.

This is what i am/was tring to replicate: TWR Jaguar XJ220:

yes i know there is alot of work. im using the AMT/ERTL jaguar xj220 model kit (YES, i know this is the bad one of the 2 kits, but i didn't want to mess up my tamiya jaguar xj220 for this yet!) here is my kit:

My AMT TWR Jaguar XJ220 DRIFT CAR

follow the link, thats what has been done so far to it before it stalled.

[89AKurt]

On 9/25/2010 at 5:13 PM, Jairus said:

[...]  Vac-forming is very easy and basic. I have showed how to do it here on the forum and it's been printed in two issues of Model Cars Magazine.

You don't need a store-brought vac-former... you can MAKE YOUR OWN!  [...]

Dredged up this ancient topic, so long-time experts on this forum won't jump on my case when I start a new topic, with a "it's been talked about before, why are you wasting our time."  But of course, now it will be "why are you dredging up this ancient and useless topic, we have 3D printing now!"  Or something like that, be creative.  I did *not* find Jairus's topic, was it scrubbed, or is it titled and tagged with something creative, like "how to make parts"?  I've had some interest on a current WIP about my vac-forming (vacuum-forming, vac-formed, vacuum-formed just so future searches will pick up this subject), thought I would start a new topic, but don't wish to waste my time if a real expert (I'm just a hack) has already done so.

[Ace-Garageguy]

30 minutes ago, 89AKurt said:

Dredged up this ancient topic, so long-time experts on this forum won't jump on my case when I start a new topic, with a "it's been talked about before, why are you wasting our time." ...

Chill, man. There's some good stuff here. I'll flag this one for myself for future reference. And vacuum forming will ALWAYS be a useful technique to have access to. The whizzbangy 3D stuff doesn't need to be employed for everything, just as carbon fiber will never replace steel in some applications.

[BigTallDad]

Did somebody say vacu-form?

http://www.modelcarsmag.com/forums/topic/101743-poor-mans-vacu-form/?tab=comments#comment-1421187

 

[89AKurt]

8 hours ago, BigTallDad said:

Did somebody say vacu-form?

http://www.modelcarsmag.com/forums/topic/101743-poor-mans-vacu-form/?tab=comments#comment-1421187

 

Thank you.